In a statement, the office announced that, according to election laws, electioneering officially ended as of 8 a.m. (03:30 GMT) on Thursday, which means that contenders, their headquarters and their fans must end all forms of campaigning.
Campaigning activities must stop 24 hours before the polls open under the law.
The 11th round of the presidential election and the 4th round of Islamic City and Village Councils election will be held in Iran on June 14.
Iranian voters will go to over 66,000 polling stations inside and outside the country on June 14 to elect their next president.
Campaigning for the June 14 presidential election kicked off in Iran on May 22 after the Guardian Council released the list of 8 qualified candidates, although 6 have remained now.
The qualified candidates represent a wide range of political streams from Principlists to reformers.
There are now 6 candidates left in the race after two of them quitted. They include Tehran Mayor Mohammad Baqer Qalibaf, Former Iranian Foreign Minister Ali Akbar Velayati, Supreme National Security Council (SNSC) Secretary and chief nuclear negotiator Saeed Jalili, former SNSC Secretary and chief nuclear negotiator Hassan Rouhani, former Oil and Telecommunication minister Seyed Mohammad Qarazi, former Commander of the Islamic Revolution Guards Corps (IRGC) and Secretary of the Expediency Council Mohsen Rezayee.